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Fanger
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Call Sign : 26ct304
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PostSubject: god help me (fuse)   god help me (fuse) Icon_minitimeSun Apr 25, 2021 7:26 pm

hello everyone 
I hope you can help.
I have been using a friends radio and now it wont stop blowing the inline fuse on the power cable.
i replaced it a number of times .
to no avail.
it powers on for a phew minutes then pops.
any ideas
thanks
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Victor
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSun Apr 25, 2021 8:01 pm

Das radio blowenfusen und corkenpoppen mit spitzensparken?


(Apologies, just light hearted humour for a bad situation. Wink)


How many 'few minutes' before blowing the fuse? On receive or transmit? (Obviously transmit uses more power than receive.) Does the radio light up and work before blowing the fuse?
What happened previous to it blowing fuses? Is the power lead all OK?

A lot of questions but you've pretty much given us all very little to go on. I'm not surprised if it's a friends radio, you're bound to be panicking!
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Fanger
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSun Apr 25, 2021 8:12 pm

 Does the radio light up and work before blowing the fuse?,,,, yes
 On receive or transmit?.....transmit.

 Is the power lead all OK? . yes. 

All connections and swr  is good.
used it last week and was fine.
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Victor
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSun Apr 25, 2021 9:12 pm

If it's just blowing on transmit it points to a few possibilities.

Are you sure that you've got the correct rated fuse in place? Fuses are easily misidentified and often mis-supplied especially the difference between quick blow and slow blow.

If the power supply is at fault it will lose its regulation on higher current demands if it's a linear rather than switched-mode type. This can cause fuses to blow, the voltage can rise as well as fall with linear regulation and that could make the radio momentarily draw more power as the power consumption increases. (The finals or output transistors will try to convert that extra voltage into more RF power increasing current draw.)

If you can try another power supply or hook up to a decent battery such as a car type to eliminate that.

If after that the radio still blows fuses then clearly the radio is at fault.


Sorry I can't be more helpful than that but diagnosing problems online from a distance can be fraught with problems.

I hope you get sorted out.


All the best,
Victor


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Fanger
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSun Apr 25, 2021 9:39 pm

Hi Victor.
first thanks for the help.
the power i have been using is a car batt.
i think the probelem must be internal.
its an old at555 that's been sat in a cupboard for a while.
i also noticed that it was off freq on ssb. but fine on the uk band.
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Alan Pilot
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeMon Apr 26, 2021 6:38 am

Old radio.
Covers off big fuse watch for the smoke lol.
That was a test i did many times.
What do you say Victor.
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Victor
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeMon Apr 26, 2021 7:00 am

That's certainly a 'fast & furious' method of fault finding Alan! Very Happy

Fingers crossed the PCB tracks are a better 'rating' than the fuse. Wink
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Alan Pilot
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeMon Apr 26, 2021 9:00 am

Yep fixed many burned tracks lol.

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Victor
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeMon Apr 26, 2021 9:09 am

Ha! Ha! Very Happy

lol!
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53 Prefect
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeMon Apr 26, 2021 11:50 am

Check the reverse polarity diode. Usually they op just after you turn it on though.

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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeFri May 07, 2021 8:59 am

If you have a multimeter, and know how to use it, measure the current (amps set for fuse rating) flowing into the rig on standby and quickly when you PTT. Then compare it with the manufacturers spec. Too high on one or the other would indicate a rig fault.

HOWEVER, It's not a good idea to leave it in line until the fuse blows as whatever is happening may be catastrophic enough to blow the multimeter fuse.

Second option. (field testing)
Covers off, run until the fuse blows again, and using your Mk.1 heat detector (your finger) find out what is glowing hot.

p.s. Have cool beer alongside you to quench your finger if burned.

Third thought.
If you are running it from a car battery, is the battery charger on the whole time?
If it is, and you have that multimeter, check that it isn't over-volting above 13.8 volts.
Especially when PTT.

Some cheaper battery chargers aren't exactly good at maintaining their voltage control when working hard and do 'surge' a bit.

Hope all that makes sense.
Good Luck.

Paul
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Fanger
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Call Sign : 26ct304
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Join date : 2021-04-18
QTH or Location : sherborne , dorset
Equipment Used : ss6900,ss9900. siro gainmaster. siro 827. serio 5000. t2lt

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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSat May 08, 2021 6:10 pm

well after a 2wk wait .i have radio back from shop.
apparently it was the inline fuse.(2 small)
yes i put a 2amp in.
so ok my mistake.still doesn't explain why the 10anp fuse blew .
i am currently waiting for a delivery of fuses as the shop never had any.
so I'm wondering how they can say it was just the fuse .
lets see what happens when i power it up.
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Alan Pilot
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSat May 08, 2021 6:27 pm

lol
I did say big fuse watch for smoke.
Tested many like that years ago.
Hope that was the problem let us know when you get you fuses if it works.
Anybody tell us what fuse you have in yours ????.

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Fanger
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Call Sign : 26ct304
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Join date : 2021-04-18
QTH or Location : sherborne , dorset
Equipment Used : ss6900,ss9900. siro gainmaster. siro 827. serio 5000. t2lt

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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeTue May 11, 2021 5:10 pm

hi all.
so my fuses arrived 2day.
and yes that was the probelem.
apparently these radios can draw 8amps.
so why do they come with a 2amp fuse installed.
thanks to all that helped trouble shoot my probelem.
i feel like a right pratt.
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Alan Pilot
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeTue May 11, 2021 6:05 pm

You didn't put the 2 amp fuse in so it's not your fault.

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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeWed May 12, 2021 5:23 pm

One reason I’ve never borrowed or lent a raisin from anyone!
If you don’t like the person then put a nail in it and deny all knowledge!😂alien
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PostSubject: Re: god help me (fuse)   god help me (fuse) Icon_minitimeSun Jul 18, 2021 8:36 pm

spitzensparken    a problem i had once..managed to short the connections where the power lead connects to the main board..so i changed the fuse,,,nothing,,thought here we go,checked the power lead with the multimeter ,,nothing..i had to actually clean off the ends of the new fuse and the 2 fuse holder connections,,think i need to buy a couple more cybernet power leads,,seem to have plenty of the uniden type,,Dont foget to get the right length of fuse for the holder!!
Have we got a "WHAT FUSE" thread anywhere?
ade
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